By Stanley White and Kevin Buckland

TOKYO (Reuters) -Bitcoin and other cryptocurrencies suffered hefty losses on Friday on fears that U.S. President Joe Biden’s plan to raise capital gains taxes will curb investment in digital assets.

The selloff came after reports that the Biden administration was planning a raft of proposed changes to the U.S. tax code, including a plan to nearly double taxes on capital gains to 39.6% for people earning more than $1 million.

Bitcoin, the biggest and most popular cryptocurrency, slumped 7% to $48,176, falling below the $50,000 mark for the first time since early-March, while smaller rivals Ether and XRP fell around 10%.

The tax plans jolted markets, prompting investors to book profits in stocks and other risk assets, which have rallied massively on hopes of a solid economic recovery. Levies on investment gains were said to be in line for record increases.

Bitcoin is on track for a 15% loss on the week, though it is still up 65% since the start of the year. Ether dropped more than 10% on the day to as low as $2,107, a day after climbing to a record $2,645.97.

But while social media lit up with posts about the plan hurting cryptocurrencies, and individual investors complaining about losses, traders and analysts said declines are likely to be temporary amid growing retail and institutional investor acceptance of digital currencies as a legitimate asset class.

“That’s what everyone is talking about now,” Chris Weston, head of research at Pepperstone Markets Ltd, a foreign exchange broker based in Melbourne, said referring to the tax plan.

“And I think you may have some technical selling going through. Ether’s been the poster child of movement. It has massively outperformed Bitcoin.”

Shares of cryptocurrency exchange Coinbase also fell 5% to $278 in U.S. pre-market trading, marking the lowest level since its listing earlier this month. The listing had driven bitcoin prices to $65,000, before pulling back 25% in the following days.

“The Coinbase listing – the ultimate poacher-turned-gamekeeper moment – might have been the high watermark for Bitcoin,” said Neil Wilson, chief market analyst at Markets.com.

(Reporting by Stanley White and Kevin Buckland in Tokyo, additional reporting by Thyagaraju Adinarayan, Sujata Rao and Karin Strohecker in London; Editing by Kenneth Maxwell and Emelia Sithole-Matarise)